Mensaje de error

• Notice: Only variables should be passed by reference en treewalk_ItemIdModel_Entity->idLoadItem() (línea 20 de /var/www/vhosts/netmonsters.es/sites/all/modules/treewalk/lib/ItemIdModel/Entity.php).
• Notice: Only variables should be passed by reference en treewalk_ItemIdModel_Entity->idLoadItem() (línea 20 de /var/www/vhosts/netmonsters.es/sites/all/modules/treewalk/lib/ItemIdModel/Entity.php).